Sequence Of Operation - Carrier 58UXT Operating Instructions Manual

BLK BLK
WHT WHT
GND
115-V FUSED
DISCONNECT
SWITCH
(WHEN REQUIRED)
Fig. 15—Heating and Cooling Application Wiring Diagram 1–Stage Thermostat and Condensing Unit
BLK
BLK
WHT WHT
GND
115-V FUSED
DISCONNECT
SWITCH
(WHEN REQUIRED)
Fig. 16—Heating and Cooling Application Wiring Diagram 2-Stage Thermostat and Condensing Unit
This furnace is equipped with a manual reset limit switch in
the gas control area. The switch will open and shut off power
to the gas valve if a flame rollout or overheating condition
occurs in the gas control area. DO NOT bypass the switch.
Correct inadequate combustion-air supply, component fail-
ure, or restricted flue gas passageway before resetting the
switch.
Before operating furnace, check each manual reset switch for
continuity. If necessary, press and release button to reset switch.
1-STAGE THERMOSTAT TERMINALS
W
FIVE
WIRE
TWO-WIRE
HEATING-
ONLY
W2
COM
W/W1
GND
Y/Y2
JUNCTION
BOX
R
CONTROL
G
BOX
24-V
TERMINAL
BLOCK
FURNACE
2-STAGE THERMOSTAT TERMINALS
SEVEN
W2
WIRE
THREE-WIRE
HEATING-
ONLY
W2
COM
W/W1
GND
Y/Y2
JUNCTION
BOX
R
CONTROL
G
BOX
24-V
TERMINAL
BLOCK
FURNACE
Y R G C
GND
CONDENSING
NOTES: 1. Connect Y-terminal as shown for proper operation.
2. Some thermostats require a "C" terminal connection as shown.
3. If any of the original wire, as supplied, must be replaced,
use same type or equivalent wire.
W1 Y2 R G Y1 C
2-SPEED
CONDENSING
UNIT
NOTES: 1. Connect Y-terminal as shown for proper operation.
2. Some thermostats require a "C" terminal connection as shown.
3. If any of the original wire, as supplied, must be replaced,
use same type or equivalent wire.
Step 2—Sequence of Operation
Using schematic diagram in Fig. 19, follow the sequence of
operation through the different modes. Read and follow diagram
very carefully.
NOTE: If power interruption occurs during "call for heat" (W/W1
or W/W1 and W2) and if the thermostat is still calling for gas
heating, the control will start a 90-sec blower only on period 2 sec
after power is restored. The red LED will flash code 12 during
90-sec period, after which the LED will be on continuously as long
as no faults are detected. After 90-sec period, furnace will respond
to the thermostat normally.
12
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
FIELD-SUPPLIED
FUSED DISCONNECT
GND
GND
GND
UNIT
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
FIELD-SUPPLIED
FUSED DISCONNECT
208/230- OR
460-V
THREE
PHASE
GND
GND
208/230-V
SINGLE
C
PHASE
Y1
GND
Y2
GND
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
A99071
A99072